<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			
			var s1 = "abc";
			var s2 = s1.concat("d" , "e" , "f");  //调用concat()连接字符串
			console.log(s2);  //返回字符串“abcdef”
		</script>
	</body>
</html>
